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2021 JEE PYQ

Get chapter-wise JEE Main & Advanced questions with solutions

Q JEE MAIN 2021 S2
If the real part of the complex number $z=\frac{3+2 i \cos \theta}{1-3 i \cos \theta}, \theta \in\left(0, \frac{\pi}{2}\right)$ is zero, then the value of $...
JEE Main Mathematics Easy
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Q JEE MAIN 2021
Consider the cell at $25^{\circ} \mathrm{C} \mathrm{Zn}\left|\mathrm{Zn}^{2+}(\mathrm{aq}),(1 \mathrm{M}) \| \mathrm{Fe}^{3+}(\mathrm{aq}), \mathrm{Fe}^{2+}(\mathrm{aq})\right| \mathrm{Pt}(\mathrm{s})$
The fraction of total iron present as $\mathrm{Fe}^{3+}$ ion at the cell...
JEE Main Chemistry Easy
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Q JEE MAIN 2021
In the following the correct bond order sequence is:
JEE Main Chemistry Easy
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Q JEE MAIN 2021 S2
The distance of the point $\mathrm{P}(3,4,4)$ from the point of intersection of the line joining the points. $\mathrm{Q}(3,-4,-5)$ and $R(2,-3,1)$ and the plane $2 x+y+z=7$,...
JEE Main Mathematics Easy
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Q JEE MAIN 2021
For the reaction
$A+B \rightleftharpoons 2 C$
the value of equilibrium constant is 100 at 298 K . If the initial concentration of...
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Q JEE MAIN 2021
White light is passed through a double slit and interference is observed on a screen 1.5 m away. The separation between the slits is 0.3...
JEE Main Physics Easy
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Q JEE MAIN 2021
Isotope(s) of hydrogen which emits low energy $\beta^{-}$ particles with $t_{1 / 2}$ value > 12 years is/are
JEE Main Chemistry Easy
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Q JEE MAIN 2021 S2
Let $\vec{a}=\hat{i}-\alpha \hat{j}+\beta \hat{k}, \vec{b}=3 \hat{i}+\beta \hat{j}+\alpha \hat{k}$ and $\vec{c}=-\alpha \hat{i}+2 \hat{j}+\hat{k}$, where $\alpha$ and $\beta$ are integers. If $\vec{a} \cdot \vec{b}=-1$ and $...
JEE Main Mathematics Medium
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Q JEE MAIN 2021
$\mathrm{CO}_2$ gas is bubbled through water during a soft drink manufacturing process at 298 K . If $\mathrm{CO}_2$ exerts a partial pressure of 0.835 bar...
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Q JEE MAIN 2021
Two travelling waves produces a standing wave represented by equation, $\mathrm{y}=1.0 \mathrm{~mm} \cos \left(1.57 \mathrm{~cm}^{-1}\right) \times \sin \left(78.5 \mathrm{~s}^{-1}\right) \mathrm{t}$. The node closest to the...
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